408 N. H. DARTON — CATALOG OF PHOTOGRAPHS 



596. Chesapeake sands, Matawan clays, and Potomac sands in road cut half a 



mile southwest of Good Hope, District of Columbia. The blade of the 

 hammer is at the Chesapeake-Matawan contact, the position of which is 

 also indicated by the arrows to the right. The Matawan- Potomac con- 

 tact is three feet below and is clearly exhibited. The Pamunkey forma- 

 tion is absent (No. 73). 



597. Shell beds in Chesapeake formation on west sideof Patuxent river, at Jones ' 



wharf, Saint Marys county, Maryland (No. 51). 



598. Cliffs of Chesapeake sands and clays surmounted by Lafayette gravelly sands, 



Plum point, Calvert county, Maryland ; looking south (No. 61). 



599. Matawan formation on east side of Gibson island, Magothy river, Aime 



Arundel county, Maryland. Shows characteristic silicious concretions in 

 place and along the shore (No. 215). 



600. Cliffs of Potomac clays, Wortons point, Kent county, Maryland (No. 206). 



601. Ferruginous concretions in sand of Potomac formation in road cuts on Pat- 



terson estate, northeastern Baltimore, Maryland (No. 219). 



602. Sands, gravels, and clays of Potomac formation in cut of Belt Line railroad, 



just east of Belair road, northeastern Baltimore, Maryland (No. 218). 



603. Columbia formation on crystalline schists near N and Twenty-fourth streets 



N. W., Washington, D. C. (No. 278). 



604. Columbia formation, basal beds, near N and Twenty- fourth streets N. W., 



Washington, D. C. (No. 282). 



Photographed by J. K. Hitlers 

 1 1 by 14 inches. Negatives in United States Geological Survey 



605. Wild Duck bluff, Chesapeake bay (no negative). 



606. Unconformity between Columbia and Potomac formations, Chesapeake bay 



(No. 336). 



607. Turkey point (No. 338). 



608. Center of Grove point, Chesapeake bay (No. 335). 



609. Section at Howell's point, Chesapeake bay (no negative). 



610. Near East Capitol street, between Sixteenth and Seventeenth, Washington, 



D. C. Columbia loam, as excavated for brick-clay, and terrace plain 

 formed by it. Natural surface. Looking southwest (No. 346). 



611. Columbia and Potomac formations, Forrest place, north side of Chase street, 



Baltimore, Maryland (No. 325). 



612. Formation of gravel from vein quartz. South side of Oakland street, 200 



yards west of Columbia road, Kalorama heights, Washington, D. C. (no 

 negative). 



613. Looking up Susquehanna river from Baltimore and Ohio railroad bridge 



(No. 340). 



614. Columbia formation on Potomac formation in Wild Duck bluff, head of 



Chesapeake bay, Maryland (No. 337). 



Photographed for N. H. Barton 

 6i by 83 inches. Negatives in United States Geological Survey 



615. The Potomac near Harpers Ferry (No. 235). 



(Hi). Junction of the Shenandoah and Potomac rivers (No. 236). 



